Paul sievert



(No Model.)

P; SIEVERT.

PROGESS'OF PRODUCING FLAT OBJECTS OF GLASS.

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UNITED STATES PATENT OFFICE. I l

PAUL SIEVERT, or DCHLEN, NEAR DRESDEN, GERMANY.

PROCESS OF PRODUCING FLAT OBJECTS OF GLASS.

. SPECIFICATION forming part of Letters Iatent No. 530,289, datedDecember 4, 1894.

Application filed N ovember 1, 1892; Serial No. 450,674. (No model.)Patented in Germany May 3, 1892. No. 67,292; inIrance September 29,1892, No. 224,636; in Belgium October 6, 1892,110. 101,611; in EnglandOctober 6,1892, lie-17,848, and in Austria-Hun gary May 8, 1893, No.49,854 and No. 90,624.

To all whom it may concern.-

Be it known that 1, PAUL SIEVERT, glassmanufacturer, of Diihlen, nearDresden,in the Kingdom of Saxony, German Empire, have invented certainnew and useful Improvements in the Process of Producing Flat Objects ofGlass and Means for Carrying Out such Process,(which have beenpatentedin Germanyby Patent No. 67,292, dated May 3, 1892; in France byBrevet dInvention No. 224,636, dated September 29, 1892; in Belgium byBrevet dInvention No.101,611, dated October 5, 1892; in Great Britain byPatent N 0. 17,848, dated October 6, 1892, and in Austria Hungary byPrivilegium No. 49,854 and No. 90,624, dated May 8, 1893,) of which thefollowing is a specification.

This invention relates to a process for producing fiat objects orarticles of glass and the process consists, first, in preparing a flatsheet of glass by pouring molten glass on a table and rolling it down toproper thickness; second, in stamping into the glass while stillin aplastic state the contours of the objects or articles to be produced;third, in grinding or polishing the plate of glass (after its havingbeen properly annealed) on one side and thereby severing the plate bysuch grinding or polishing process into the difierent objects orarticleswhich are intended to be produced.

In using colored, opaque, colorless or any convenient sort of glass for-my object in View, I may produce letters, figures, frames, rings or anyother articles of a fiat shape in an easy, cheap and convenient mannerbecause I obviate the handling and grinding the surface and bottom ofeach object separately, by not stamping them out entirely of the plasticglass, but by allowing them to remain coherent in the plate or sheet ofglass, which allows of grinding or polishing the plate or sheet in theusual way, such grinding or polishing on the lower side of the glasssheet or plate may be so far extended, that the small thickness of glassmaterial between the deepest point of the contour and the under face ofthe glass sheet or plate is removed by the grinding or polishingprocess.

For stamping the contours of the articles to be produced into the glassI prefer to use a press with a plate, which at its under side isprovided with fillets of a conical shape,

said fillets forming the contours of the objects or articles to beproduced and said plate being suitably arranged to be pressed down.

in a plastic condition, said press with the I press plate is shifted bymeans of wheels and track over the glass sheet step by step, ac-

cording to the length of the glass sheet and is operated to stamp intothe entire glass sheet consecutively the contours on the press plate.

In the annexed drawings '1 have shown in Figure 1 a side view, in Fig. 2an end view, and in Fig. 3 a plan of the complete apparatus for stampingthe contours into the sheet of glass. Fig. 4 is a face view of a plateernployed in this, apparatus, and Fig. 5 represents a vertical section,on a larger scale, of part of the same plate.

a is the table to receive the molten glass.

cis theroller for rolling the molten glass down to proper thickness.

The roller 0 is mounted on a carriage with wheels I) and counter wheelsb, the wheels 1) running on rails 17? atboth sides of the table a, thewheels I) taking underneath said rails.

The roller 0 may be adjusted in its bearings according to the thicknessof articles or ob- 'jects to be produced.

g are rails on both sides along the table a for carryingthe press. Onthese rails the carriage and framingl of the press may run by means ofthe wheels h. The carriage is provided with rollers, bolts or bracketsis, arranged to take underneath the rails b if pressure is exerted topress the press plate downwardly. In the framing 1 guides are arrangedfor the vertical spindle m which at its lower end carries the pressplate 2', which press plate is provided at its under side with, as shownin Fig. 5, conical or V-shaped fillets forming the contours of theobjects or articles to be produced. The spindle m is cranked and aneccentric disk at is placed into the for the required distance and Irepeat the pressing down of plate i, and this shifting and pressing isrepeated so often as the length of glass sheet will allow or require. Ofcourse this repeated pressing of contours into the .glass sheet must beso timed that the glass sheet is in a proper plastic condition toreceive the impressions of the contours. If the sheet of glass thusprovided with contours all over its upper surface is in a condition tobe removed from the table a, I transport it in an annealing oven andafter having been properly annealed, I subject the glass sheet to agrinding or polishing operation. This grinding or polishing operationmay be completed first on the upper side and thereafter on the lowerside, this operation on the lower side being carried out to such anextent that the small thickness of glass between the depth of thecontours and the lower surface is removed, whereby I am now enabled tocollect the ready ground flat articles of glass singly or separately.

I may dispense with the roller 0 for rolling down the sheet of glass toproper thickness in such cases in which the extension of the sheet iscomparatively small. a press plate with smooth under side or face may beused to press the poured molten glass flat and to the required thicknessand thereafter the press plate iwith the contours may come intooperation to press into the thus prepared fiat sheet of glass thecontours of the fiat articles or objects to be produced.

In such cases, 1

.my lnvention I have signed my name in pres- If I desire to produce fiatarticles or objects of glass with a convex surface, which I am enabledto form by my process of stamping the conical shaped fillets into theplastic sheet of glass, I do not grind or polish the upper surface ofthe sheet of glass, but I limit this grinding and polishing operation tothe lower side of the glass sheet, severing thereby such sheet into thesingle and separate articles or objects of glass which now have aplaneunderside and a convex upper side, which objects'or articles will have avery fine appearanice by the rounded off edges of their upper s1 es.

The fiat glass-ware produced by the process herein described is not apart of the present invention. Neither is the apparatus herein describedand shown as used in said process; but the said apparatus is the subjectof my application for United States Patent, Serial No.493,973, filedDecember 18, 1893, patented October 80, 1894, No. 528,940, and the saidglass-ware is the subject of my application for United States Patent,Serial No. 505,832, filed March 31, 1894..

What I claim is- The process for producing flat articles or objects ofglass, consisting in first. pouring molten glass on a table, nextrolling. or pressing the so poured glass down to produce a sheet ofproper thickness, next stamping into the said sheet while yet. plasticthe contours of the articles or objects to be produced, atterwardannealing the said sheet and finally grinding the said sheet on one sidetoseparate or sever the fiat articles or objects out of the said sheetof glass, substantially as herein set forth.

In testimony that I claim the foregoing as ence of two subscribingwitnesses.

PAUL SIEVERT.

Witnesses:

GEORG RICHTER, WILHELM WIEsENHiJTTER.

